Groovy example source code file (MinusEqualsTest.groovy)

This example Groovy source code file (MinusEqualsTest.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Groovy tags/keywords

character, character, groovytestcase, minusequalstest, minusequalstest, sortedset, sortedset, treeset, treeset

The Groovy MinusEqualsTest.groovy source code

package groovy

class MinusEqualsTest extends GroovyTestCase {

    void testIntegerMinusEquals() {
        def x = 4
        def y = 2
        x -= y
        
        assert x == 2
        
        y -= 1
        
        assert y == 1
    }

    void testCharacterMinusEquals() {
        Character x = 4
        Character y = 2
        x -= y
        
        assert x == 2
        
        y -= 1
        
        assert y == 1
    }
    
    void testNumberMinusEquals() {
        def x = 4.2
        def y = 2
        x -= y
        
        assert x == 2.2
        
        y -= 0.1
        
        assert y == 1.9
    }
    
    void testStringMinusEquals() {
        def foo = "nice cheese"
        foo -= "cheese"
        
        assert foo == "nice "
    }


    void testSortedSetMinusEquals() {
        def sortedSet = new TreeSet()
        sortedSet.add('one')
        sortedSet.add('two')
        sortedSet.add('three')
        sortedSet.add('four')
        sortedSet -= 'one'
        sortedSet -= ['two', 'three']
        assertTrue 'sortedSet should have been a SortedSet',
                   sortedSet instanceof SortedSet
        assertEquals 'sortedSet had the wrong number of elements', 1, sortedSet.size()
        assertTrue 'sortedSet should have contained the word four', sortedSet.contains('four')
    }
}